Ana Belén Montes downfall began in 1996, when an astute DIA colleague - "David" - acting on a gut feeling - reported to a security official that he felt Montes might be under the influence of Cuban intelligence. The official interviewed her, but she admitted nothing.
Ana Belén Montes gave a full confession on March 19, 2002, acknowledged revealing the identities of four American undercover intelligence officers working in Cuba, pled guilty in 2002 and was sentenced to 25 years in prison.